text: const expect = require('expect');
  const isArray = require('./isArray.js');
  
  test('isArray is a Function', () => {
    expect(isArray).toBeInstanceOf(Function);
  });
  test('passed value is an array', () => {
    expect(isArray([1])).toBeTruthy();
  });
  test('passed value is not an array', () => {
    expect(isArray('array')).toBeFalsy();
  });
  